shader: cleanup unused variable and invariable conditions
The ctx variable is set to 0 on the line before so ctx.prog_type is always 0 which is TGSI_PROCESSOR_FRAGMENT.
mask_temp are leftover variables from e853d88d.
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The ctx variable is set to 0 on the line before so ctx.prog_type is always 0 which is TGSI_PROCESSOR_FRAGMENT.
mask_temp are leftover variables from e853d88d.